Defects in RbF - Treated Cu(InxGal-x)Se2 Solar Cells and Their Impact on Voc

Michael Miller, Ana Kanevce, Alexandra Bothwell, Stefan Paetel, Darius Kuciauskas, Aaron Arehart

Research output: Contribution to conferencePaper


Cu(In,Ga)Se2 solar cell efficiency is limited by VOC due in large part to bulk defects limiting lifetime, but alkali treatments such as RbF recover some of the VOC loss. In this work, defects in RbF-treated and untreated CIGS were quantitatively characterized using DLTS and DLOS, and three main defects were identified in each sample. The RbF-PDT resulted in a large decrease in the mid-gap trap concentration, which was accompanied by a large improvement in minority carrier lifetime. This lifetime improvement combined with a change in doping accounted for a significant portion of the VOC improvement in the RbF CIGS.
Original languageAmerican English
Number of pages3
StatePublished - 2023
Event2023 IEEE 50th Photovoltaic Specialists Conference (PVSC) - San Juan, Puerto Rico
Duration: 11 Jun 202316 Jun 2023


Conference2023 IEEE 50th Photovoltaic Specialists Conference (PVSC)
CitySan Juan, Puerto Rico

NREL Publication Number

  • NREL/CP-5900-88879


  • charge carrier lifetime
  • doping
  • integrated circuit modeling
  • limiting
  • photovoltaic cells
  • photovoltaic systems
  • semiconductor process modeling


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